flyingpig said:
Spheres
Conductor, otherwise it wouldn't matter right?
Of course it matters.
Here's the deal with them being conductors.
The only way to maintain an electric field in the interior (a location
surrounded by conducting material) of an electric conductor is to keep removing charges from one region an supplying them to another. In a static situation, this is
NOT what is happening.
The electric field in the region: b < r < c, has and electric field of ZERO! If you consider a closed surface (such as a sphere with radius R : b < R < c), the electric flux through this surface is zero because the electric field is zero everywhere on the surface of this sphere. Therefore the net charge within the sphere of radius R is zero (Gauss's Law). Also, no net charge can reside (statically) at any location interior to a conductor. Therefore, there must be a net charge of ‒Q distributed on the inner surface of the conducting spherical shell with inner radius b. This is where your
E field lines should terminate in your sketches. (If the spheres are concentric, this charge is distributed uniformly on the inner surface.)
If the net charge on the spherical
shell is Q, and a charge of ‒Q is on the inner surface, what is the net charge on the exterior surface (radius = c) of the shell?
BTW: If there are no sources or sinks of electric field external to the spheres, then the charges on the exterior of the shell are distributed uniformly whether or not the solid sphere is at the center of the shell.